Pyrex bowl 401 1 1/2 PT ovenware

bottom shows 401 1 1/2 PT. Trademark 17 pyrex R (with a circle around it) made in U.S.A. ovenware small really old bowl with wear from use. still pretty in my opinion and displays well and works well as a small mixing bowl for me. I use it to mix smaller amounts of things together when baking cookies. according to how to tell the age of your pyrex, anything with the trademark logo and made in the USA in capital letters as this bowl shows would have been made in the mid 1950s or so. when cared for this dish could possibly last another 50 years or more. warning tips below for extended care. this is not shown as microwave safe. I do not recommend using dishes in a microwave if they do not say microwave safe as they could break. also do not go from hot oven to cold countertops without a hot pad under a pyrex dish as it could break from the faat temperature change. not recommended for dishwasher, scrubby scouring pads, leaving in dishwater for an extended time nor harsh cleansers.